Development and Strategic Research of Practical Applications in Sports Nutrition

Overview

This study evaluates the practical feasibility and potential effects of an 8-week dairy product intervention in physically active adults aged 18-39 years. Participants will consume a dairy product enriched with high protein, calcium, and vitamin D under real-life conditions. Assessments will be conducted before the intervention, after 4 weeks, and after 8 weeks, including subjective perception questionnaires, body composition analysis, and functional physical performance tests. The study aims to examine changes in physical status, functional capacity, and user experience during continuous product use.

Detailed description

With increasing awareness of regular exercise and health promotion, sports nutrition products have become a common supplementation choice among physically active populations. In real-world settings, these products are typically consumed continuously as part of daily life. Evaluating changes in physical status, functional physical performance, and users' subjective perceptions during actual use therefore requires research designs that closely reflect everyday living conditions.

This study recruits physically active adults aged 18-39 years and conducts an 8-week intervention involving the consumption of a dairy product enriched with high protein, calcium, and vitamin D. A pre-, mid-, and post-intervention design is employed, integrating subjective perception questionnaires, body composition analysis, and functional physical performance assessments to evaluate changes in physical status, functional capacity, and subjective experiences throughout the intervention period. Through this multi-dimensional evaluation approach, the study aims to examine the practical feasibility and application value of the product in real-life settings and to provide evidence to support sports nutrition practice and future research.

Interventions

• Dietary supplement Dairy intervention
  An 8-week high-protein, high-calcium, and vitamin D-enriched dairy intervention.

Primary outcome measures

• Questionnaire-based subjective assessment [Time frame: The testing time points are set as follows: before the intervention, after 4 weeks of intervention, and after 8 weeks of intervention.]
• Handgrip Strength Test [Time frame: The testing time points are set as follows: before the intervention, after 4 weeks of intervention, and after 8 weeks of intervention.]
• Push-Up Test [Time frame: The testing time points are set as follows: before the intervention, after 4 weeks of intervention, and after 8 weeks of intervention.]
• Curl-Up Test [Time frame: The testing time points are set as follows: before the intervention, after 4 weeks of intervention, and after 8 weeks of intervention.]
• Three-Minute Progressive Step-in-Place Test [Time frame: The testing time points are set as follows: before the intervention, after 4 weeks of intervention, and after 8 weeks of intervention.]

Secondary outcome measures (7)

• Body weight [Time frame: The testing time points are set as follows: before the intervention, after 4 weeks of intervention, and after 8 weeks of intervention.]
• Body mass index [Time frame: The testing time points are set as follows: before the intervention, after 4 weeks of intervention, and after 8 weeks of intervention.]
• Body fat percentage [Time frame: The testing time points are set as follows: before the intervention, after 4 weeks of intervention, and after 8 weeks of intervention.]
• Fat mass [Time frame: The testing time points are set as follows: before the intervention, after 4 weeks of intervention, and after 8 weeks of intervention.]
• Skeletal muscle mass [Time frame: The testing time points are set as follows: before the intervention, after 4 weeks of intervention, and after 8 weeks of intervention.]
• Skeletal muscle percentage [Time frame: The testing time points are set as follows: before the intervention, after 4 weeks of intervention, and after 8 weeks of intervention.]
• Waist-to-hip ratio [Time frame: The testing time points are set as follows: before the intervention, after 4 weeks of intervention, and after 8 weeks of intervention.]

Eligibility criteria

Inclusion criteria

• Aged 18-39 years.
• Have regular exercise habits, defined as exercising at least three times per week, with each session lasting no less than 30 minutes. Exercise intensity should reach a heart rate of approximately ≥130 beats/min or a perceived intensity characterized by noticeable breathlessness and sweating.
• Preferably, at least one exercise session per week should include resistance training.
• Participants must be able to consume dairy products and have no lactose intolerance.

Exclusion criteria

• Individuals with lactose intolerance or an allergy to dairy products.
• Individuals who are pregnant, planning to become pregnant, or breastfeeding.
• Individuals with a smoking habit.
• Individuals diagnosed by a physician with cardiovascular disease, hypertension, metabolic disease, asthma, or kidney disease.
• Individuals with a body mass index (BMI) ≥27.
• Individuals who have experienced limb or neuromuscular exercise-related injuries within the past 6 months that prevent them from engaging in regular exercise.

Criteria are shown verbatim from the registry (in English). Final eligibility is always assessed by the study center.

Healthy volunteers: Yes

Study design

Allocation

N/A

Model

Single group

Masking

Open label

Primary purpose

Basic science

Study locations

Center list to be confirmed — check the primary protocol.

Identifiers

NCT: NCT07598786 · NTSUIRB-115-010

Primary sources (government registries)

• ClinicalTrials.gov (US NIH)

View this study on ClinicalTrials.gov ↗